Stylus pen



FIG. 1 is a front perspective view of a stylus pen according to a first embodiment of my new design;

FIG. 2 is a back perspective view thereof;

FIG. 3 is a side view thereof, the side opposite of the side shown in FIG. 3 being a mirror thereof and therefore not shown;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines show portions of the stylus pen which form no part of the claimed design. 

CLAIM The ornamental design for a stylus pen, as shown and described. 